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D( x )
(5/4)*x-((x/2)*x)-1 = 0
(5/4)*x-((x/2)*x)-1 = 0
(5/4)*x-((x/2)*x)-1 = 0
(-1/2)*x^2+(5/4)*x-1 = 0
5/4*x-1/2*x^2-1 = 0
DELTA = (5/4)^2-(-1*(-1/2)*4)
DELTA = -7/16
DELTA < 0
x in (-oo:+oo)
(((3*x)/2)*x-2-1)/((5/4)*x-((x/2)*x)-1) = 0
(((3*x)/2)*x-2-1)/((-1/2)*x^2+(5/4)*x-1) = 0
(3/2*x^2-3)/(5/4*x-1/2*x^2-1) = 0
5/4*x-1/2*x^2-1 = 0
5/4*x-1/2*x^2-1 = 0
DELTA = (5/4)^2-(-1*(-1/2)*4)
DELTA = -7/16
DELTA < 0
1 = 0
3/2*x^2-3 = 0
3/2*x^2 = 3 // : 3/2
x^2 = 2
x^2 = 2 // ^ 1/2
abs(x) = 2^(1/2)
x = 2^(1/2) or x = -2^(1/2)
x in { 2^(1/2), -2^(1/2) }
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